package study.javase.juc;

public class ConcurrencyTest {
    private static final long count = 10000000l;
    public static void main(String[] args) throws InterruptedException {
        concurrency();
        serial();
    }
    private static void concurrency() throws InterruptedException {
        // 起始时间
        long start = System.currentTimeMillis();

        Thread thread = new Thread( ()-> {
                        int a = 0;
                        for (long i = 0; i < count; i++) {
                            a += 5;
                        }

                });
        /*Thread thread = new Thread(
                new Runnable() {
                    @Override public void run() {
                        int a = 0;
                        for (long i = 0; i < count; i++) {
                            a += 5;
                        }
                    }
                }); */
        thread.start();
        int b = 0;
        for (long i = 0; i < count; i++) {
            b--;
        }
        long time = System.currentTimeMillis() - start;
        thread.join();
        System.out.println("concurrency :" + time+"ms,b="+b);
    }
    private static void serial() {
        long start = System.currentTimeMillis();
        int a = 0;
        for (long i = 0; i < count; i++) {
            a += 5;
        }
        int b = 0;
        for (long i = 0; i < count; i++) {
            b--;
        }
        long time = System.currentTimeMillis() - start;
        System.out.println("serial:" + time+"ms,b="+b+",a="+a);
    }
}